OpenGL2.0库文件

/* Two-Dimensional Sierpinski Gasket */ /* Generated Using Randomly Selected Vertices */ /* And Bisection */ #ifdef __APPLE__ #include <GLUT/glut.h> #else #include <GL/glut.h> #endif void myinit() { /* attributes */ glClearColor(1.0, 1.0, 1.0, 1.0); /* white background */ glColor3f(1.0, 0.0, 0.0); /* draw in red */ /* set up viewing */ /* 500 x 500 window with origin lower left */ glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluOrtho2D(0.0, 50.0, 0.0, 50.0); glMatrixMode(GL_MODELVIEW); } void display( void ) { GLfloat vertices[3][2]={{0.0,0.0},{25.0,50.0},{50.0,0.0}}; /* A triangle */ int j, k; int rand(); /* standard random number generator */ GLfloat p[2] ={7.5,5.0}; /* An arbitrary initial point inside traingle */ glClear(GL_COLOR_BUFFER_BIT); /*clear the window */ /* compute and plots 5000 new points */ glBegin(GL_POINTS); for( k=0; k<5000; k++) { j=rand()%3; /* pick a vertex at random */ /* Compute point halfway between selected vertex and old point */ p[0] = (p[0]+vertices[j][0])/2.0; p[1] = (p[1]+vertices[j][1])/2.0; /* plot new point */ glVertex2fv(p); } glEnd(); glFlush(); /* clear buffers */ } void main(int argc, char** argv) { /* Standard GLUT initialization */ glutInit(&argc,argv); glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB); /* default, not needed */ glutInitWindowSize(500,500); /* 500 x 500 pixel window */ glutInitWindowPosition(0,0); /* place window top left on display */ glutCreateWindow("Sierpinski Gasket"); /* window title */ glutDisplayFunc(display); /* display callback invoked when window opened */ myinit(); /* set attributes */ glutMainLoop(); /* enter event loop */ }